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Asset Write-Downs and Other Charges and Credits (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Restructuring Cost and Reserve [Line Items]        
Acquisition and related integration costs $ 0 $ 0 $ 0 $ 578
Midroll        
Restructuring Cost and Reserve [Line Items]        
Earn-out provision adjustment 2,500      
Sale of Business | Newspaper Syndication        
Restructuring Cost and Reserve [Line Items]        
Gain on sale of business $ 3,000